84개의 결과 중 1 - 5개
Variability-- Individual differences— Doubtful species— Wide ranging, much
diffused, and common species vary most — Species of the larger genera in any
country vary more than the species of the smaller genera— Many of the species
of the ...
On the generality of intercrosses between individuals of the same species— Cir
cumstances favourable and unfavourable to Natural Selection, namely,
intercrossing, isolation, number of individuals— Slow action-- Extinction caused
by Natural ...
As many more individuals of each species are born than can possibly survive ;
and as, consequently, there is a frequently recurring struggle for existence, it
follows that any being, if it vary however slightly in any manner profitable to itself,
When we look to the individuals of the same variety or sub-variety of our older
cultivated plants and animals, one of the first points which strikes us, is, that they
generally differ much more from each other, than do the individuals of any one ...
under confinement ; and when, on the other hand, we see individuals, though
taken young from a state of nature, perfectly tamed, long-lived, and healthy (of
which I could give numerous instances), yet having their reproductive system so ...
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